Agilex™ 7 Hard Processor System Technical Reference Manual

ID 683567
Date 8/13/2024
Public
Document Table of Contents

16.5.8.1. Suspend and Resume Sequence

For SDIO cards, a data transfer between an I/O function and the controller can be temporarily halted using the SUSPEND command. This capability might be required to perform a high‑priority data transfer with another function. When desired, the suspended data transfer can be resumed using the RESUME command.

The SUSPEND and RESUME operations are implemented by writing to the appropriate bits in the CCCR (Function 0) of the SDIO card. To read from or write to the CCCR, use the controller’s IO_RW_DIRECT command.